1 files changed, 106 insertions, 0 deletions
diff --git a/qml_plugin/src/qml_interface/mathcalc.rs b/qml_plugin/src/qml_interface/mathcalc.rs
new file mode 100644
index 0000000..601dc3b
--- /dev/null
+++ b/qml_plugin/src/qml_interface/mathcalc.rs
@@ -0,0 +1,106 @@
+use cxx_qt::{CxxQtType, Threading};
+use cxx_qt_lib::{QString, QVariant};
+use kalk::parser;
+use std::{pin::Pin, sync::Arc};
+use tokio::sync::Mutex;
+use unwrap_print::PrintableResult;
+
+use crate::ExclusiveExecutor;
+
+const DEFAULT_ANGLE_UNIT: &str = "deg";
+
+#[cxx_qt::bridge]
+mod qobject {
+    extern "C++" {
+        include!("cxx-qt-lib/qstring.h");
+        include!("cxx-qt-lib/qvariant.h");
+        type QString = cxx_qt_lib::QString;
+        type QVariant = cxx_qt_lib::QVariant;
+    }
+
+    extern "RustQt" {
+        #[qobject]
+        #[qml_element]
+        #[qml_singleton]
+        #[qproperty(QVariant, result)]
+        type MathCalc = super::MathCalcRs;
+
+        #[qinvokable]
+        fn query(self: Pin<&mut MathCalc>, input: QString);
+
+        #[qinvokable]
+        fn reset(self: Pin<&mut MathCalc>);
+
+        #[qinvokable]
+        fn reset_ctx(self: Pin<&mut MathCalc>);
+
+        #[qinvokable]
+        fn reset_result(self: Pin<&mut MathCalc>);
+    }
+
+    impl cxx_qt::Threading for MathCalc {}
+}
+
+pub struct MathCalcRs {
+    result: QVariant,
+    ctx: Arc<Mutex<parser::Context>>,
+
+    executor: ExclusiveExecutor,
+}
+
+impl Default for MathCalcRs {
+    fn default() -> Self {
+        Self {
+            result: QVariant::default(),
+            ctx: Arc::new(Mutex::new(qobject::MathCalc::new_ctx())),
+            executor: ExclusiveExecutor::default(),
+        }
+    }
+}
+
+impl qobject::MathCalc {
+    fn query(mut self: Pin<&mut Self>, input: QString) {
+        let qt_thread = self.qt_thread();
+        let ctx = Arc::clone(&self.as_mut().rust_mut().ctx);
+        // TODO: consider moving to spawn_blocking
+        self.rust_mut().executor.spawn(async move {
+            let input = input.to_string();
+            let result = parser::eval(
+                &mut *ctx.lock().await,
+                &input,
+                // TODO: move to const/config
+                53,
+            )
+            .map_or_default(|r| {
+                r.map_or_default(|r| {
+                    let r: QString = r
+                        // to display scientific notation properly
+                        // other ones show both version without e or shows *10^_
+                        // and have a = prefix
+                        // to_string_big will result in 1/2=5.0000000000000000e − 1
+                        .to_string()
+                        .into();
+                    if r != input.into() { QVariant::from(&r) } else { QVariant::default() }
+                })
+            });
+            _ = qt_thread.queue(|mut qo| qo.as_mut().set_result(result)).unwrap_print();
+        });
+    }
+
+    fn reset(mut self: Pin<&mut Self>) {
+        self.as_mut().reset_result();
+        self.reset_ctx();
+    }
+
+    fn new_ctx() -> parser::Context {
+        parser::Context::default().set_angle_unit(DEFAULT_ANGLE_UNIT)
+    }
+
+    fn reset_ctx(mut self: Pin<&mut Self>) {
+        self.as_mut().rust_mut().ctx = Arc::new(Mutex::new(Self::new_ctx()))
+    }
+
+    fn reset_result(mut self: Pin<&mut Self>) {
+        self.as_mut().set_result(QVariant::default())
+    }
+}